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Extraction composition, extraction system, extraction method and back extraction method

A composition and extraction technology, applied in the direction of improving process efficiency, etc., can solve problems such as equipment corrosion, low yield, and long product purification process

Active Publication Date: 2017-12-08
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The problem to be solved by the present invention is that, in order to overcome the shortcomings of the existing extractant for extracting lithium from lithium-containing brine, such as severe corrosion of equipment, large extraction agent dissolution loss, low single-stage extraction rate and low yield, and long product purification process, and Provide an extraction composition, extraction system, extraction method and stripping method

Method used

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  • Extraction composition, extraction system, extraction method and back extraction method
  • Extraction composition, extraction system, extraction method and back extraction method
  • Extraction composition, extraction system, extraction method and back extraction method

Examples

Experimental program
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Effect test

Embodiment 1

[0069] Lithium-containing brine consists of:

[0070]

[0071] Organic phase: using kerosene as a diluent, the contents of the compounds N,N-bis(2-ethylhexyl)acetamide, N,N-bis(2-ethylhexyl)propionamide and TBP in the kerosene solution were 25 %, 5%, 30% (each component occupies the percentage of the total volume of the organic phase);

[0072] Take 1 portion of lithium-containing brine, add FeCl 3 As a co-extractant, Fe in the aqueous phase 3+ / Li + The molar ratio is 1.3, fully dissolved. Add 2 parts of the above organic phase (extraction ratio, organic phase / water phase, ie O / A=2:1), and fully mix the two phases at 25°C for extraction. After the mixing is completed, let it stand for stratification, the effect of phase separation is good, the water phase is colorless, and the interface between the two phases is clear. Determination of Li in the equilibrium aqueous phase and organic phase, respectively + 、Na + 、K + , Mg 2+ Concentration, the extraction rate of Li ca...

Embodiment 2

[0074] Lithium-containing brine consists of:

[0075]

[0076] Organic phase: using kerosene as a diluent, the contents of the compounds N,N-bis(2-ethylhexyl)acetamide, N,N-bis(2-ethylhexyl)propionamide and TBP in the kerosene solution were 10 %, 60%, 10% (each component occupies the percentage of the total volume of the organic phase);

[0077] Add 2 parts of lithium-containing brine in a separatory funnel, add FeCl 3 As a co-extractant, the Fe in the aqueous phase 3+ / Li + The molar ratio is 1.1, 1 part of the above organic phase (compared to O / A=1 / 2) is added, and the two phases are fully mixed at 25° C. for extraction. After the mixing is completed, let it stand for stratification, the effect of phase separation is good, the water phase is colorless, and the interface between the two phases is clear. Determination of Li in the equilibrium aqueous phase and organic phase, respectively + 、Na + 、K + and Mg 2+ , thus calculating the extraction rate of Li to be 91.26...

Embodiment 3

[0079] Lithium-containing brine consists of:

[0080]

[0081] Organic phase: using kerosene as diluent, the contents of compounds N,N-bis(2-ethylhexyl)acetamide, N,N-bis(2-ethylhexyl)propionamide and TBP in kerosene solution were 5 %, 5%, 80% (each component occupies the percentage of the total volume of the organic phase);

[0082] Add 1 part of lithium-containing brine in a separatory funnel, add FeCl 3 As a co-extractant, the Fe in the aqueous phase 3+ / Li + The molar ratio was 1.75, and 6 parts of the above organic phase were added as the extraction composition (compared to O / A=6 / 1), and the two phases were fully mixed at 40°C for extraction. After the mixing is completed, let it stand for stratification, the effect of phase separation is good, the water phase is colorless, and the interface between the two phases is clear. Determination of Li in the equilibrium aqueous phase and organic phase, respectively + 、Na + 、K + and Mg 2+ , thus calculating the extracti...

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Abstract

The invention discloses an extraction composition, an extraction system, an extraction method and a back extraction method. The extraction composition comprises an extraction agent and a neutral phosphorus-oxygen compound, and the extraction agent comprises N,N-di-(2-ethylhexyl) acetamide and N,N-di-(2-ethylhexyl) propanamide. The extraction composition provided by the invention is good in pH stability, low in water solubility, density and viscosity, free of complex extraction operation, small in corrosion to equipment and suitable for the industrial operating requirements.

Description

technical field [0001] The invention relates to an extraction composition, an extraction system, an extraction method and a stripping method. Background technique [0002] Lithium not only has important applications in the defense industry, but its importance in the national economy is also becoming increasingly evident, especially in the energy field: 6 Li and 7 Li is an important material for the fuel of future nuclear fusion reactors and nuclear fission reactions, respectively; it is also in increasing demand as a battery material. Therefore, lithium is known as "the energy metal of the 21st century". The demand for lithium continues to grow at home and abroad, so the research, development and utilization of lithium resources are imminent. [0003] Salt lake brine is an important resource of lithium. my country is rich in salt lake brine lithium resources, and its reserves rank among the top in the world. However, since brine contains a variety of metal ions, its com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/28C22B26/12
CPCC22B26/12C22B3/28Y02P10/20
Inventor 袁承业李晋锋
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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